When you have sex with someones partner’s sibling.
You had sex with my girlfriends sister? Dude now where eskimo-in-laws!
by 1234556780 November 13, 2019
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When you beat off or rub one out while looking at a picture of or thinking about the daughter of your buddy (18+).
I rubbed one out thinking about Poe's daughter last night, so now Poe is my eskimo father in-law
by Super Cool Dude January 18, 2013
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When two guys each have sex with a different full blooded sister.
what's up Joe, I just banged Becky. Really? I banged her sister! That makes us Eskimo brothers-In-Law!
by Mushroom Stamper April 10, 2015
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When you think about your friends girlfriend while masturbating.
Hey dude i was thinking about your girl while i was jerkin it.
Dude i was thinking about your girl while i was jerkin it too.

we are so eskimo brother in laws
by Lilseanzie December 9, 2009
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When one jerks it to their friend's hot sister.
I totally rubbed one out to Greg's sister last night; that makes him my eskimo brother in-law now right?
by the leagueeee December 21, 2010
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A girl that has fucked your eskimo brother but not you
Bro, I was about to get with this chick but she fucked Chad.

Dude, never fuck your eskimo sister in laws. That's almost incest.
by Callmedad42 July 23, 2017
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Eskimo-in-law: two men have had sex with twin sisters.
Person 1. M and G are Eskimo-in-laws now.

Person 2. How? What’s that?

Person 1. They both slept with twin sisters.

Person 2. That’s crazy!
by Jimmy Epstien October 22, 2019
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